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(1 大唐定邊風(fēng)力發(fā)電有限責(zé)任公司, 榆林 719000; 2 蘭州大學(xué)土木工程系, 蘭州 730000)
摘要: 為探究黃土濕陷性對風(fēng)電基樁水平承載特性的影響,在陜西省定邊縣某黃土場地設(shè)置 3 根試樁進(jìn)行水平載荷試驗(yàn),其中 1 根樁周土保持天然狀態(tài),2 根樁周土在加載前已經(jīng)浸水飽和且濕陷穩(wěn)定。 分析了各級水平荷載作用下兩類試樁樁頂水平位移、樁身彎矩及其分布范圍、水平抗力系數(shù)的比例系數(shù) m 值的差異。 試驗(yàn)結(jié)果表明:樁周土飽和濕陷明顯增大了樁的水平位移,隨著水平荷載增加這種現(xiàn)象更為顯著;樁周土飽和濕陷時(shí)的樁身彎矩大小及其分布范圍均比樁周土天然狀態(tài)時(shí)大;冪函數(shù)能夠較好地反映不同樁頂水平位移與 m 值之間關(guān)系,可以通過建立冪函數(shù)以獲取 m 值及其相應(yīng)單樁在地面處水平位移的對應(yīng)關(guān)系。
關(guān)鍵詞: 黃土; 飽和濕陷; 風(fēng)電基樁; 水平荷載試驗(yàn); 水平位移; 樁身彎矩; m 值
中圖分類號:TU198 文獻(xiàn)標(biāo)志碼:A 文章編號:1002?848X(2022)14?0141?05
DOI:10?? 19701 / j?? jzjg?? 20200818
Experimental study on horizontal bearing capacity of wind power foundation piles incollapsible loess site
XIE Long1, ZHAO Ye2, XUE Qi1, ZHANG Yuchuan2, WANG Hengtao1, YAO Yongguo2
(1 Datang Dingbian Wind Power Generation Co. , Ltd. , Yulin 719000, China; 2 Department of Civil Engineering,Lanzhou University, Lanzhou 730000, China)
Abstract: In order to explore the effect of loess collapsibility on the horizontal bearing characteristics of wind powerfoundation piles, three test piles were set up in a loess site in Dingbian County, Shaanxi Province for horizontal load tests.Among them, the surrounding soil of 1 pile remains in its natural state, and the surrounding soil of 2 piles has beensaturated with water and has stable collapsibility before loading. The differences of the horizontal displacement of the piletop, the bending moment of the pile body and its distribution range, and the scaling factor for horizontal resistance factor mvalue of the two types of test piles under the action of horizontal loads at all levels were analyzed. The test results show thatthe saturated collapsibility of the soil around the pile significantly increases the horizontal displacement of the pile, and thisphenomenon is more significant with the increase of the horizontal load. The magnitude and distribution range of thebending moment of the pile body when the soil around the pile is saturated and collapsible are larger than those when thesoil around the pile is in the natural state. The power function can better reflect the relationship between the horizontal displacement of pile tops and the m value, and the corresponding relationship between the m value and the horizontaldisplacement of the corresponding single pile on the ground can be obtained by establishing a power function.
Keywords: loess; saturation collapsibility; wind power foundation pile; horizontal load test; horizontal displacement;bending moment of pile body;m value
第一作者:謝龍,碩士,高級工程師,主要從事地基基礎(chǔ)方面研究,Email:1729400334@ qq. com。通信作者:張?jiān)ゴ?,碩士,教授,主要從事地基基礎(chǔ)方面研究,Email: zhangshch@ lzu. edu. cn。[引用本文] 謝龍, 趙野, 薛奇,等. 濕陷性黃土場地風(fēng)電基樁水平承載特性試驗(yàn)研究[ J]. 建筑結(jié)構(gòu),2022,52(14):141?145. XIE Long, ZHAO Ye, XUE Qi, et al. Experimental study on horizontal bearing capacity of wind powerfoundation piles in collapsible loess site[J]. Building Structure,2022,52(14):141?145.
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